Hi Wax.
We're a split family, she gets so much off her dad and so much from me in return for helping out with her younger siblings now and again. She gets about £60 per month, sometimes more. When she's being a complete arse she gets much less.
Clothes and shoes wise, I buy school uniform, a coat and a pair of decent shoes, underwear, and jeans. Anything else she wants, she pays for. She bought herself converse because she liked them. She has asked for a pair of specific boots for her Christmas box, and that's what she'll get from me with odds and ends in her stocking as you'd expect.
She's free to use the toiletries in the bathroom, laundry gets thrown in the machine if it appears in the basket, if there's food in she can eat it as long as it's not earmarked for dinner.
She plays a musical instrument, and I pay the insurance on that as it's not a cheap one to replace should it get broken. She plays in bands and orchestras. She gave up on scouting, but had she continued I would have continued paying her subs.
She has an older iPhone on a basic contract. Again, when behaviour isn't acceptable the phone goes. The main house computer is hers to use as she wishes, but it's the house machine and as suck lives downstairs.
We share a bus pass, as when I need it she's at school, and when she needs it I'm usually holed up on the sofa hiding from the universe.
It works. She doesn't have unreal expectations. She doesn't demand things her peers have, because quite frankly she knows it's bollocks. If she did try it, she'd be told to pack it in and get over herself.